I think that using Bible or Christian themed fabrics and embroidered verses would actually mean more than the name of a block. I have a book that is called "Christian blocks" and honstly, I can't see why they are any more Christian than any other blocks--If someone didn't give me the name of the block, esp. if I were unfamiliar with quilting, I'd never have "gotten it" that they were "Christian blocks."
So, if you just do blocks like Jacob's Ladder, etc., make sure you include an explanation with the quilt. Otherwise all your work will be wasted effort. (I speak from the perspective of a fellow missionary in Poland.)